August in Des Moines averages a daily high of 29.1°C with nights around 18.5°C. Expect roughly 9.2 wet days totalling 98.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Des Moines is September.
Based on DES MOINES INTERNATIONAL AIRPORT, IA US (8.3km), 1995–2024. 30 years of August data.